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KENNEDY SPACE CENTER, FLA. - The STS-111 and Expedition 5 crews eagerly stride from the Operations and Checkout Building toward the waiting Astrovan that will take them to Launch Pad 39A and Space Shuttle Endeavour. From front to back are Pilot Paul Lockhart and Commander Kenneth Cockrell; astronaut Peggy Whitson and Expedition 5 Commander Valeri Korzun (RSA); cosmonaut Sergei Treschev (RSA); and Mission Specialists Philippe Perrin (CNES) and Franklin Chang-Diaz. STS-111 is the second Utilization Flight to the International Space Station, carrying the Multi-Purpose Logistics Module Leonardo, the Mobile Base System (MBS), and a replacement wrist/roll joint for the Canadarm 2. Also onboard Space Shuttle Endeavour is the Expedition 5 crew who will replace Expedition 4 on board the Station. The MBS will be installed on the Mobile Transporter to complete the Canadian Mobile Servicing System, or MSS. The mechanical arm will then have the capability to "inchworm" from the U.S. Lab Destiny to the MSS and travel along the truss to work sites. Expedition 4 crew members will return to Earth with the STS-111 crew on Endeavour.